Sounds as if you are on the ball concerning tests and pre surgery. Do have your other thyroid numbers checked.
It's difficult when weight becomes an issue along with other symptoms...I have been overweight most of my life, even though i exercise. I'm being serious about my eating since being told I'm pre diabetic. It's not easy, but if I don't have the stuff in my house, I don't eat it.
I hope that you can get some answers regarding your neurological symptoms. Make sure to keep a symptom journal with dates of onset & dissipation. Many of us took years before we got answers. I was diagnosed with fibromyalgia years before I got an MS dx.
Keep in touch-there's a lot of info and support here!!